jsp项目运行后页面报错

ARN:oejsh.ErrorHandler:qtp1335520301-21: EXCEPTION 
org.apache.jasper.JasperException: /WEB-INF/views/include/_head.jsp (line: 1, column: 2) Page directive: illegal to have multiple occurrences of contentType with different values (old: text/html; charset=UTF-8, new: text/html;charset=UTF-8)
    at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:41)
    at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:275)
    at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:107)
    at org.apache.jasper.compiler.Validator$DirectiveVisitor.visit(Validator.java:135)
    at org.apache.jasper.compiler.Node$PageDirective.accept(Node.java:571)
    at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376)
    at org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2428)
    at org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2434)
    at org.apache.jasper.compiler.Node$Root.accept(Node.java:464)
    at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376)
    at org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2428)
    at org.apache.jasper.compiler.Validator$DirectiveVisitor.visit(Validator.java:101)
    at org.apache.jasper.compiler.Node$IncludeDirective.accept(Node.java:635)
    at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376)

解决问题

原来是包含页面与被包含页面的@page指令里面的contentType不一致，仔细检查两个文件第一行的 @page，包含页面的是：

<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>

被包含页面：

<%@ page language="java" contentType="text/html;charset=utf-8" %>

果然contentType里面内容不一样，把两个文件第一行的@page内容改为一致，再执行程序，运行通过。

建议

建议在项目里全量替换：将所有jsp页面都加上@page 头内容值要一致。